How to build a Extended Telephone Ring Amplifier/Repeater Circuit

The talked about phone repeater circuit can increase the range of your land line ring sound from the phone such the particular one has the capacity to make a call heard in another room or perhaps in another house.

How to build a Simple Music Box Circuit

This uncomplicated circuit are useful to obtain the operation of a music box.

How To Build a Digital Voice Changer Circuit

The publish describes a circuit which includes the capability to modify or transform an individuals unique voice into a totally new form.